rProtein A/G Beads 4FF is an affinity chromatography medium designed for the purification of monoclonal antibody and polyclonal antibody at both laboratory and process acale. The rProtein A/G is coupled to highly cross-linked 4% agarose beads by a technique which generates a stable thioether linkage between rProtein A/G and the agarose beads. The coupling technique is optimized to give a high binding capacity for IgG.This binding capacity,together with the excellent kinetic and flow properties of the highly cross-linked beads.rProtein A/G Beads 4FF can be used for antibody purification, immuneprecipitation and Co- immuneprecipitation.